我正在努力将CSV转换为XML数据。通过查看各种示例，我能够编写用于解析CSV文件和获取XML文件的代码。但是，我编写的代码返回带有错误标记的XML文件。
这是转换代码：
package com.adarsh.parse;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class Converter {
/* Protected members to avoid instantiation */
protected DocumentBuilderFactory domFactory = null;
protected DocumentBuilder domBuilder = null;
/* Constant strings */
// Input CSV file
final String INPUT_FILE = "sample_data.csv";
// Output XML document
final String OUTPUT_FILE ="in.xml";
// First element in the XML document
final String FIRST_ELEMENT="school";
public Converter(){
try {
domFactory = DocumentBuilderFactory.newInstance();
/* Obtaining instance of class DocumentBuilder */
domBuilder = domFactory.newDocumentBuilder();
}
catch(ParserConfigurationException exp) {
System.err.println(exp.toString());
}
catch(FactoryConfigurationError exp){
System.err.println(exp.toString());
}
catch(Exception exp){
System.err.println(exp.toString());
}
}
/**
* This method converts the given CSV file into an XML document
*/
public int convert(String csvFileName, String xmlFileName) {
int rowCount = -1;
try {
/* Initializing the XML document */
Document newDoc = domBuilder.newDocument();
/* Creating the root element in the XML */
Element rootElem = newDoc.createElement(FIRST_ELEMENT);
newDoc.appendChild(rootElem);
/* Reading the CSV file */
BufferedReader csvFileReader;
csvFileName = INPUT_FILE;
csvFileReader = new BufferedReader(new FileReader(csvFileName));
/* Initialize the number of fields to 0 */
int fieldCount = 0;
String[] csvFields = null;
StringTokenizer stringTokenizer = null;
/**
* Map the column names in the CSV file as the elements in the XML
* document, eliminate any other characters not eligible for XML element
* naming
*/
/* Initialize the current line variable */
String currLine = csvFileReader.readLine();
/* Loop until we reach the end of the file
* edge case: Empty CSV file
* */
if(currLine != null) {
/* Separate fields based on commas */
stringTokenizer = new StringTokenizer(currLine, ",");
fieldCount = stringTokenizer.countTokens();
/* If there is data in the CSV file */
if(fieldCount > 0) {
/* Initialize a String Array of Fields */
csvFields = new String[fieldCount];
int i = 0;
/* Loop till all elements are found and save fields */
while (stringTokenizer.hasMoreElements()) {
csvFields[i++] = String.valueOf(stringTokenizer.nextElement());
}
}
}
else {
System.out.println("Nothing to parse");
}
/* reading rows from the CSV file */
while((currLine = csvFileReader.readLine()) != null) {
stringTokenizer = new StringTokenizer(currLine, ",");
fieldCount = stringTokenizer.countTokens();
/* if rows exist in the CSV file*/
if(fieldCount > 0) {
/* Create the row element*/
Element rowElem = newDoc.createElement("row");
int i = 0;
/* until there are more elements*/
while(stringTokenizer.hasMoreElements()) {
try {
/* Append each element found to each row element*/
String currValue = String.valueOf(stringTokenizer.nextElement());
Element currElem = newDoc.createElement(csvFields[i++]);
currElem.appendChild(newDoc.createTextNode(currValue));
rowElem.appendChild(currElem);
}
catch(Exception exp) {
}
}
/* Append the rows to the root element*/
rootElem.appendChild(rowElem);
rowCount++;
}
}
/* Finish reading the CSV file */
csvFileReader.close();
/* Saving the generated XML doc into required format file to disk */
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
aTransformer.setOutputProperty(OutputKeys.METHOD, "xml");
aTransformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
Source src = new DOMSource(newDoc);
xmlFileName = OUTPUT_FILE;
Result dest = new StreamResult(new File(xmlFileName));
aTransformer.transform(src, dest);
rowCount++;
}
catch(IOException exp) {
System.err.println(exp.toString());
}
catch(Exception exp) {
System.err.println(exp.toString());
}
/* Number of rows parsed into XML */
return rowCount;
}
}
这是文件中的示例CSV数据：
classroom_id，CLASSROOM_NAME，teacher_1_id，teacher_1_last_name，teacher_1_first_name，teacher_2_id，teacher_2_last_name，teacher_2_first_name，student_id数据，student_last_name，student_first_name，student_grade 103，Brian's Homeroom，10300000001，O'Donnell，Brian ,,,,,,, 102， Smith先生的PhysEd课程，10200000001，Smith，Arthur，10200000011， Patterson，John，10200000011，McCrancy，Brandon，1 102，Smith先生 PhysEd Class，10200000001，Smith，Arthur，10200000011，Patterson， 约翰，10200000018，雷金纳德，亚历克西斯，1 102，史密斯先生的PhysEd班， 10200000001，Smith，Arthur，10200000011，Patterson，John，10200000019， Gayle，Matthew，1 102，Smith先生的PhysEd Class，10200000001，Smith， Arthur，10200000011，Patterson，John，10200000010，Smith，Nathaniel，1 102，史密斯先生的PhysEd班，10200000001，史密斯，亚瑟， 10200000011，Patterson，John，10200000013，Lanni，Erica，1 102，Mr。 Smith的PhysEd Class，10200000001，Smith，Arthur，10200000011， 帕特森，约翰，10200000014，弗洛雷斯，迈克尔，1 102，史密斯先生 PhysEd Class，10200000001，Smith，Arthur，10200000011，Patterson， 约翰，10200000012，马可，伊丽莎白，1 102，史密斯先生的PhysEd班， 10200000001，Smith，Arthur，10200000011，Patterson，John，10200000016， 佩雷斯，布列塔尼，1 102，史密斯先生的PhysEd班，10200000001，史密斯， Arthur，10200000011，Patterson，John，10200000015，Hill，Jasmin，1 102，史密斯先生的PhysEd班，10200000001，史密斯，亚瑟， 10200000011，Patterson，John，10200000017，Hiram，William，1 101，Mrs。 琼斯的数学课，10100000001，琼斯，芭芭拉,,, 10100000015， 克鲁兹，亚历克斯，1 101，琼斯夫人的数学课，10100000001，琼斯， Barbara ,,, 10100000014，Garcia，Lizzie，1 101，Mrs。Jones'Math Class，10100000001，Jones，Barbara ,,, 10100000013，Mercado，Toby， 1 101，琼斯夫人的数学课，10100000001，琼斯，芭芭拉,,,, 10100000011，Gutierrez，Kimberly，2 101，琼斯夫人的数学课， 10100000001，Jones，Barbara ,,, 10100000010，Gil，Michael，2
我希望在XML文件中获得如下输出：
<grade id="1">
<classroom id="101" name="Mrs. Jones' Math Class">
<teacher id="10100000001" first_name="Barbara" last_name="Jones"/>
<student id="10100000010" first_name="Michael" last_name="Gil"/>
<student id="10100000011" first_name="Kimberly" last_name="Gutierrez"/>
<student id="10100000013" first_name="Toby" last_name="Mercado"/>
<student id="10100000014" first_name="Lizzie" last_name="Garcia"/>
<student id="10100000015" first_name="Alex" last_name="Cruz"/>
</classroom>
<classroom id="102" name="Mr. Smith's PhysEd Class">
<teacher id="10200000001" first_name="Arthur" last_name="Smith"/>
<teacher id="10200000011" first_name="John" last_name="Patterson"/>
<student id="10200000010" first_name="Nathaniel" last_name="Smith"/>
<student id="10200000011" first_name="Brandon" last_name="McCrancy"/>
<student id="10200000012" first_name="Elizabeth" last_name="Marco"/>
<student id="10200000013" first_name="Erica" last_name="Lanni"/>
<student id="10200000014" first_name="Michael" last_name="Flores"/>
<student id="10200000015" first_name="Jasmin" last_name="Hill"/>
<student id="10200000016" first_name="Brittany" last_name="Perez"/>
<student id="10200000017" first_name="William" last_name="Hiram"/>
<student id="10200000018" first_name="Alexis" last_name="Reginald"/>
<student id="10200000019" first_name="Matthew" last_name="Gayle"/>
</classroom>
<classroom id="103" name="Brian's Homeroom">
<teacher id="10300000001" first_name="Brian" last_name="O'Donnell"/>
</classroom>
</grade>
这就是我目前获得输出的方式：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<school>
<row>
<classroom_id>101</classroom_id>
</row>
<row>
<classroom_id>101</classroom_id>
</row>
<row>
<classroom_id>101</classroom_id>
</row>
<row>
<classroom_id>101</classroom_id>
</row>
<row>
<classroom_id>101</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>102</classroom_id>
</row>
<row>
<classroom_id>103</classroom_id>
</row>
</school>
有人可以帮我这个吗？我想知道我哪里出错了。感谢
P.S。我已经在stackoverflow上提到了有关CSV到XML转换的其他问题。但是，我无法找到适合我的问题的解决方案或解释。
P.S.S。如果不是必须将此类CSV数据解析为XML，请不要建议我使用XSLT。如果没有其他选择，那么我将不得不去学习XSLT，因为我对XSLT知之甚少。如果你建议改变我已经编写的代码，我会非常感激。
答案 0 :(得分：1)
您的CSV内容似乎没有新行分隔符。